On 29 November 2020, the Holy Father accepted the resignation from the pastoral care of the diocese of Hearst-Moosonee, Canada, presented by Bishop Robert Ovide Bourgon, and appointed Bishop Terence Thomas Prendergast, S.J., as apostolic administrator of the same see.
On December 3, 2018, His Holiness Pope Francis united the Diocese of Moosonee with the Diocese of Hearst. He appointed the Most Reverend Robert Bourgon as Bishop of the new Diocese of Hearst-Moosonee.
Prior to this appointment, these two dioceses were ruled by a single bishop since 2006 but maintained their own existence.